There were four years, 1931-1935, when I was myself a member of Hayek's seminar in London; it has left a deep mark on my thinking... At the end of the discussions in that seminar … we were, I believe, on the point of taking what now seems to me to be a decisive step. I was, at least, on the point of taking it myself. There is evidence for that in my "Value and Capital", much of the groundwork for which was done before I left London.

p. 97 - Classics and Moderns, (1983)